keep oneself dark—be characterized by inconspicuous behavior; keep out of the public eye:
- He hid himself … kept himself dark, as he says, out of the way and out of the trial.
keep someone in the dark—keep a person in ignorance about smth.:
- He is prepared to do things his own way and to keep everyone else in the dark as to what is happening.
Note: The expression does not correlate in meaning with the phrase be dark on someone—(Austral. sl.) be angry or annoyed with a person:
- Dad’s going to be dark on me for getting home so late.